The intent is to provide an easy way to do center-center, since that is a common case, but legacy requires nearest-start for no-argument or `true` calls.
i.e.
```
elm.scrollIntoView({}); // center-center
elm.scrollIntoView(); // nearest-start
elm.scrollIntoView(true); // nearest-start
elm.scrollIntoView(false); // nearest-end
```
I would also recommend reading the editor's draft: https://drafts.csswg.org/cssom-view/
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